Re: ADDITIONAL SPOILERS LIKELY IN THIS THREAD
oh, yeah, totally! I can see that simplifying things in his head a lot -- like, okay, he wants to stay angry at Duke Fabre, who ruined his life and killed everyone he loved. And it's easier to keep that distinction if it's Asch, who's clearly a dick, who's the "real" Fabre.
...and then Luke grows up to be somebody really worth admiring and Guy learns how to let the past go so he's not consumed by bitterness the way our antagonists are and they are SO GODDAMN GOOD FOR EACH OTHER omg.